Windshield cleaner



Oct. 13, 1953 A. c. ALLEN 2,654,907

` WINDSHIELD CLEANER Filed Aug. 19. 1949 3 Sheets-Sheet l Oct. 13, 1953 A. c. ALLEN 2,654,907

WINDSHIELD CLEANER Filed Aug. 19, 1949 3 Sheets-Sheet 2 8 150 60 .122 140 120 114 4 ,516i Sigg 6 j4116 144 i I.` ,106

26 g4 108 20 j1028 F E5', 4.

' f 814g f2 92 f 126 n 124 68 15o 60 114Z 134 A l` i 120 122 1.36 u 8 146 144 .Il i 142 2 ;/E.5 26 20110- 13g' l s' 104 116 11.9 24

M.: v j a@ y fr0 .94 108 28 92 WllmllllllllIIHUUUtA 64 :xxg 4 56 144 13 l 60 146 138 150 14o i 96 28 17in/6,71 for .rzur (f/len Patented Oct. 13, 14953 WINDSHIELD CLEANER Arthur C. Allen,` Chicago, Ill., assignor to Stewart- Warner Corporation, Chicago, Ill., a corporation of Virginia Application August 19, 1949, Serial No. 111,270

zo claims. 1

The present invention relates to windshield cleaners and more particularly to a cleaner including mechanism for oscillating a plurality of wiper blades in out-of-phase relation and for parking them automatically at the same position relative to the windshield when the cleaner stops operating.

The amount of torque required to oscillate a windshield wiper blade varies considerably throughout the stroke of the blade. Since mechanically driven cleaners ordinarily have a ilexible drive shaft for driving the cleaner operating mechanism from a rotary part of the engine of the vehicle in which the cleaner is installed, this shaft in conventionally operating cleaners is required to transmit torque of widely varying magnitude depending on the position of the Wiper blades in their stroke. This has a deleterious eiect on the flexible drive shaft because it causes the latter to wind up and unwind with the variations in torque. As a result, the flexible shafts wears much faster than one applying a uniform torque. This disadvantage of conventional windshield cleaners having two wiper blades has, to a large extent, been avoided in the cleaner of the present invention by providing mechanism for oscillating a plurality of wiper blades out of phase.

Accordingly, an object of the invention is to provide a windshield cleaner embodying mechanism for oscillating a plurality of wiper blades out of phase.

Another object of the invention is to provide a windshield cleaner, embodying mechanism as set forth in the preceding object, which parks the blades automatically at the same position relative to the windshield, namely, at the outermost limit of the stroke of the blades.

A further object of the invention is to provide a new and improved windshield cleaner as set forth in the preceding objects, having a single manually operable control to control operation` cf the cleaner.

A still further object of the inventionV is the provision of a new and improved windshield cleaner embodying operating mechanism for oscillating a plurality of wiper blades which includes a lost motion driving connection and a manually operable control operable to render the lost motion driving connection effective to cause the wiper blades to be oscillated in out-of-phase relation when the cleaner is operating, and operable to cause lost motion to be taken up be.

fore the cleaner stops operating When the control is operatedto discontinue operation of the cleaner.

Yet another object of the invention is to provide a new and improved windshield cleaner embodying `operating mechanism for oscillating a pair of Wiper blades permanently drivingly connected to one wiper blade and including a disengageable driving connection between the second blade and operating mechanism and a control operable to start operation of the cleaner and temporarily to disconnect the driving connection to the second blade and temporarily to disconnect the driving connection to this wiper blade when the control is operated to discontinue operation of the cleaner.

A more general object of the invention is to provide a windshield cleaner as set forth in the preceding objects which may be made primarily from inexpensive sheet metal stampings and standard parts and which is easy to assemble and install so that it may be sold and installed at relatively low cost but which nevertheless is sturdy and not subject to breakdowns.

These and other objects, advantages, and capabilities of the invention will become apparent from the following description wherein reference is had to the accompanying drawings in which: i

Fig. 1 is a more or less diagrammatic front elevational view of a fragment of an automotive vehicle showing the improved cleaner of the present invention secured therein;

Fig. 2 is a fragmentary front elevational view of the cleaner operating mechanism showing the position the parts `assume when the cleaner is inoperative; l

Fig. 3 is a longitudinal transverse sectional view of the cleaner operating mechanism taken on the line 3-3 of Fig. 2;

Fig. 4 is a cross-sectional view similar to Fig. 3 but showing the position the parts assume Hwhenthe cleaner is about to become operative;

position they assume when the cleaner is operating Fig. 7 is an axial sectional view on an erl-` larged scale through the power takeoff which l drives the flexible driveshaft, showing a `clutch l A means for connecting thisdrive shaft to a rotary source ofpow'er; y A i p Fig@ is a fragmentary top plan view of a portion of the operating mechanism of the cleaner 3 with the parts in the position they assume when the cleaner is operating; and

Fig. 9 is a graphic representation of the torque required to drive a conventional mechanically ible drive shaft, and its housing, and the clutch elements may be of the same construction and assembled in the same manner as the corresponding parts of the windshield cleaner disoperated windshield in which the blades are 5 closed in the previously mentioned application driven in phase compared to the torque required to drive a cleaner of the same type in which the blades are driven- *ing outgof-phase vvrelation, y one blade drifying mechanism beingr 27 0" al'iead-v 0L' the other.

The basic operating mechanism -of the wind-4 shield cleaner of the present invention issiznilan. to that of the windshield cleaner disclosd'inthe application for patent of 0h11T Victor; Stanley for patent.

The operating mechanism I4 includes a. worm (flig) y.wl'iclris rotatedlby the ilegible shaft wand which drives a worm-wheel 58'fon the actu- 10 ating shaft I8. Worm 56 and the actuating shaft liilare rotatably supported in suitable bearings in agean b oxl as described in the previously mentioned" application for patent, Serial No. 71,924.

, 'IThee-uppenzendloffhtkglexible drive shaft housing Dahlgren, Serial No. 71924,; Iliid; Januari@` 2191 15 izissecureii'gtoitliis gear box, and the latter is 1949, and entitled Windshield Cleaner, said application having matured into Pa/tent No... 2,600,622, June 17, 1952. The' construction and' operation of the elements in the windshield.

supported21fronr"tl/re supporting bar I6 by a generally... Uffsliaperly:` mounting bracket 62 (Figs. 2 and 33' which has a front wall or ilange 64 and adbackz'wall' or flange 65, A portion of the gear cleaner of the present application which are sim- 20 box nests between these walls and is rigidly ila no those in -thaclea-ni .diselosedisftheabeve mentioned application rfor `patent1- have not been-1 'i nl edsqlesurezseeuredthereto byfzsuitableilm'eans's,l The b'a'ek wall oflthefbracket' ,islxedr adjacent its; uppev end togthe supporting. bar" I6 .to hold; the? saizfeb ongthebar.

Worm y 56;.is'- hollow' and has .anx axially slotted-i5- extensionf, 68 (Figsa- 2f andi 5),v which" .proj upwardly from the upper side of the'A gear: bois (ill.r DSecured to theuppenend `of the;flexible drive inthe extension Alon; the worm'ftoifornia driv connectionfbetweenthefshaft and:wohni-l S'inc f theeX-tensionfimfis yloosely receivediin:.tlrefrhollowf wlorrniy 56,9 while Vthe ilexiblelshaftlfll fis loslf crank anni!) n the drivendisc ZAfrecproatef. a pair., of copositelyextending links V25 f;andl 28,

sat' atthe. latter alevrocked wnentheilinksaare; 451w ingaconnection between Vthe clutchjelernents- 50i reciprocated. A pair of wiper blade arms 34ste.:

ewigen-blades@ are securedare oscinateu by ,thesa roc laslraftss.l The structurefnf the.wiper.f4 blades. and; b1.a.deeaunsfandina- Y linkse, am the-a Y removablesupporter -fmcrrmrfor-`juie1er/effil is provided -by-.ae'control plate' 80 pivotallysecured'j upon the forwardly projecting end of'fthe'niain web of the yoke or lever 12. At its lower end the spring 86 is engaged in a spiral groove in a headed pin or stud 90 which passes freely through an aperture in a rearwardly bent ear 92 on Ithe lower edge of the front wall 64 of the supporting bracket. By virtue of this construction, the tension in the spring 86 can be adjusted by turning the stud 90 in one direction or the other, depending on whether more or less tension is ciesired in the spring. Since the lever 'I2 is connected to the control plate 80, the biasing effect of spring 86 will also be exerted on the control plate.

By reason of the interconnection between the lever 'I2 and control plate 80 through the pin 82 and the loose connection between the rear end of the lever and the fulcrum pin 16, the lever may pivot or rock about its rear end upon the fulcrum pin 'I6 or its rear end may illoat relative to the fulcrum pin when the lever rocks on pin 82. The stages in the operation of the declutching mechanisrn at which it rocks and those at which it floats Will be explained in detail subsequently. Due to the fact that the spring 86 is always under tension, the control plate 80 and lever 'I2 normally will be urged to the position shown in Fig. 6. At this position of the parts the clutch elements 50 and 52 are held in driving engagement by spring 54.

When the parts are rocked in a counterclocl wise direction in opposition to the biasing force of the spring 86, they will ultimately `assume a position substantially as shown in Fig. 2. At this position of the parts the flexible shaft assembly has been moved axially upwardly by the forward end oft he lever 12 `sufficiently so that the driving connection between the clutch elements 50 and 52 is broken. The portion of the declutching mechanism thus far described may be of the same construction as the corresponding parts of the windshield cleaner disclosed in the aforementioned Patent No. 2.600,622, and may operate in the same manner. However, the mechanism for rocking the control plate 80 and lever I2 in the cleaner of the present invention differs somewhat in construction from that used in the cleaner of this prior application, but like that mechanism it operates in coordinated relation with the structure which oscillates the Wiper blade arms so that the blades are always stopped at parked position.

As previously explained, this latter structure includes the rear crank arm 20 which is iixedly secured upon the rear end of the actuating shaft I8 and the driven disc 24 on the front end of this shaft. Crank arm 20 rocks the left-hand wiper blade arm rock shaft 32, as seen in Fig. l, through the link 26. The other wiper blade arm rock shaft is rocked by the link 26 which ls reciprocated by the driven disc 24, to lwhich it is secured by means of a pin 94 extending through one end of link 28 and into the disc adjacent its periphery.`suitable spacing washers or other spacing means being interposed between the link and the driven disc. This disc is rotatably received upon the forward end of the actuating shaft i8, but is locked against axial movement relative thereto in any suitable manner.

A driving connection between the driven disc 24 and actuating shaft I8 is established through a disc-shaped drive member 96 which has a rearwardly extending hub 98. The forward end of this hub is cylindrical and loosely receives a rearwardly extending hub |00 on the driven disc 24 so that these two `parts may rotate freely relative to each other while its rear end has a square aperture adapted to be received upon a squared portion |02 of the actuating shaft I8 to form a permanent driving connection between these parts.

Adjacent the periphery of the drive disc 96 a drive pin |04 is xedly secured, and the driven disc has an aperture |06 extending through the same and a recess |08 extending only partway through the disc spaced angularly 270 forward of the aperture in the direction of rotation of the actuating shaft and drive disc 96, i. e., in a clockwise direction, as seen in Figs. 2 and 3. Drive pin |04 may be received in either the aperture or the recess. inasmuch as the drive pin |04 is in the same angular position relative to the shaft I8 as a pin I I0 connecting the back lilik 26 to the crank arm 20 and the' aperture |06 in the driven disc 24 will be in this same angular position when the drive pin |04 is engaged therein while the pin 94 connecting the front link 28 to this disc (Fig. 5) is approximately 180 removed from this position, the two wiper blades 36 will -be in phase or in other words in the same position relative to tthe windshield when the drive pin |04 is in this aperture.

However, when the drive pin |04 is in recess |08, the drive pin and the crank arm 20 will be displaced angularly approximately with respect to the pin 94 connecting the front link 28 to the driven disc 24. As a result the blade connected t0 this crank arm, i. e., the left-hand blade (Fig, l), will be at a position in its oscillation approximately 270"` ahead of the right-hand blade so that the two blades are displaced relatively in their stroke approximately 90. In Fig. 1 the parts are shown at the position they assume when the drive pin 04 (Fig. 2) is about to drop into recess |08 and thus establish a driving connection with the driven disc 24 to cause the righthand blade to oscillate. At this time the lefthand blade 36 has been moved from its extreme left-hand or parked position (shown in full lines) to its extreme right-hand position, and from this latter position approximately halfway back to its rst mentioned position as indicated in phantom. As long as the drive pin remains in recess |00 the blades will oscillate at approximately 90 displacement with one blade trailing the other.

At this displacement of the blades or some other displacement which causes one blade to be in an advanced position in its stroke relative to the other blade there is less fluctuation in the torque required to drive the operating mechanism because the periods at which maximum and minimum torque are required to oscillate each blade are not concurrent. Thus there is less winding and unwinding of the flexible drive shaft when the cleaner is operating and as a result less wear on this shaft. The improved operating mechanism of the` present invention is designed normally to operate the wiper blades approximately 90 out of phase in their stroke in order to reduce wear on the flexible shaft 40.

However. in order to park both blades at the same position relative to the windshield, preferably at the outermost limit of their stroke, they must be brought into phase at approximately or displacement before operation of the cleaner is discontinued. The mechanism for causing the blades to shift into and out of this relationship operates in conjunction with declutching mechanism for starting and stopping operation of the cleaner l.and is controlled -by the same manual control vwhich conditions the declutching mechanism for operation. A i

e.. n. an

.. .el lever -tlrerelomdeolutehine tneiiezr- ,env-.esten tuineludee ehutmentuieruleer slide H2 (Figs. 2 and 3) slidably oarriednlgemeeliauism-` rookies.- they Qontrol'. plete L, or

risa... ...liv irom-the-eaeli side 9.6.. iudeeted.. El .slidefrriev oeretraoted-suuieieutlv ire. vented. oositionto moveits. ouseteud outoithe oath. offretatiou offA .the lue. Uil, es.: indicated in Eig. 6.

Slide. .l It; is. moved bv er eentrol esule lziteueh Bowden. Wire wnioiismauipulated-tbv-meerrs et Control knob tuoi shown). Preieralvlv.Y looeted. on tire.. Yirl.struuretui. uanel'oi the veliiele At its, lower erre the.- Bowden vvire. tresses.. freely through eri? aperture.. in the offset portion |16. of thesliue audlelost. motion oouueotierr withthe slide. is..previueo1bv reir. or. soaeeri.` ebutuieuts 12.2. 'euri 12.4 flredonthe wire l tion opposite-sides of the Offset lle.

.In 171e.` 6 the perte of.. tiret Windshield. Cleaner .are shown in .the positientiiev assunte.` when kthe cleaner is,- oueratine... llo.. deolutehthe.. iiexible drive..-ehaft.,iii` andtherebv. sten the oleauenV the slide 16.2. muette movedforvverd1 to theriehtiin Fie- 6) te the. position shownin Fie. 2^.. When the lue, I lii;ou.-.tla.e drivediset. whieh. .rotates in fa.. clockwise .direetion strikes. the lnjrderside of the.- slideA it. goles... tire. .Control plate. tu; counter'- clockwise upon themeinfulerumnin 16. from the position .show inllie.. 6" to the position shown Fier.;

.Since the.- lever' 1.1!1 is .eoiirieeted to the Qontrol plate. tllrbv. the ein erwhioh terms anteriisror the lever,v movement ofthe eontrolnlate shifts thisexis arouridifulorum ein lliz against the re.- sisteuoe or. tire eoliustiriesleriue 8.6." eorineoteei'to the lever audtlierlesilole .siiait'loiasinesnrine 5.4 Whielieets through this streit; the forwerd end of the. lever 1.2; .Friction oetvveeu.` the eluteh; elements. et end '52.; the eleaneris Qperetine, greatly. inereeses tire resistance, of' the iiexible drive to exiai movemeutrelthouen orioe these elements.. siert ite seperate; thisl resistance is greatly reduced 'd ue to the resulting rredliced are@J` ,of Contact between` these parts:

In order to'secure deelutching'vvitn-a'snep action, thejspririg 86`is`sQ1adJusted `that the resist.- arree of the iiexiblesiiaft tofaxiel. movement dure ing the initial portion of the rocking'nrovenient ofthe .Control plete Bills. greater thanthe resistanoe of the serine-gite: es @result during this initialv interval, the. forward. end oi the liever .1.2 remains stationary. andtherealf Qlldj rises relai* tive.A to the ixed .fulerum 16,; .thereby increasing H0 eoeeeetiiie. the, line Zetefthe. crank erm .29.eudsir1ee the torque required tofturri theonerfetirie is et e ruiniirluuiwlientue @laides reeeli parked position there will he .less firietiorialresistente to.V deeluteliine ety this tune it. morereedilv oeeurs with. el snep aetion- The reletivelv Ierse frietionel resistanee between-tire uleoleseud .the windshield prevents overrunrriue. when .tlee'fleiiible drive Snert-is declutchved. ft willV be apparent. that the. tinieat which deolutehius; oeeurs een .be varied` semer Whitt by adjustingrthe. spring; A

In addition to operating the slide for thepurnosev above deseribed.. tlreBowden wire,- |20 also operates meeheuism for causing the. bladeseerreally. to ouereteout-of phase-displaced 90* from eaCh other. andato behlought. into phase imme- Ciiatelvl prior to theY time that the exible drive s,1.ief..t.is.`v deeluteliedli so that the bleues. will both park et the samenositionreletive to the wind- Shelf- This. nlechani'srnincludes. a lever indicated( in itsentirety ett-it comprising a shaft |28 (Ei'gs. 2 .ztnd3). rotatably supportedby bracket 130 seeured' to tlie .front Wall. of the mounting Bracket 52; Fixedto the opposite ends ofths shaftisa nair of lever arms. Briand. |34... The lower' lever erin 13e nes, etflependng. lug or roller |36" which engages in @cam slot' |38 in a flange lloextending` y1jel:ini.1, \;z from a collar [4,2- surrounding,.- the iiuo. drive dise Sti Coller 1.4.21'is xed'aeeinst axial movenlentlrelartve. to the drive discV in any euiteble rrlarmer,y but thev latter is rotatable rela.- tive to the Collar..

.Slot litres. inelined portion liliana an er# euetenertiorii etflievirigf its center attire. axis of' the shaft |281 A; suitably mounted torsion spring idbiasesthe lever IZLin'a'cQllllrolock- Wise direction (as seen` inFigs.' 3 'and 4) or, in ctnerwords, in a; direction to. move the lug `IIiti out of the arouatenortion M6 ofv theeemyslot.

TueBOWClen. Wire' liti is connected atfits.. lower enditothe upper AarmA |32 on lever' |26. By'retra,cting, .this Wire to its. full; extent;` the lever "I 2.6 may be swungclockwise (Fig. 3) farenougn to move ythe 'lug iafromthe top of the4 inclined portion' |44 of nthe cem'slot'y [38" to the Outer "end of thearcuate portion [46,: Duringmoveinent'of the 'lug li'frorn theupper'to the'lower end of the inclinedportionV HMV of ytl'1e^s1ot,' the collar M2 'is fully retracted 'and fullyretracts `driveV disc tte-wey from; the'drven disc 24. As the lug..l36 moves in the arcuate portion l|il5*of tthe cam slot the -collar and drive disegi vare hel-dl in Vstationary retracted'nosition; A

The` torsionspring 416:8 f isfsvtrongr enough `.to

AroektheleverV i25- counterelockwise when the Bowden Avvire is released- -far enougl'iy to carry lug 5361Qutofjthe' arcuate portion I fof theearnslot into. the :inclined portion" lad and.' to draw the Eowden. Wiretortvard'with thelever A coil enrineiiii en the shaft i8' between the. drivedijsc 9.6. aridi the iront well. oi. the'mounting breoket 62 biases the: drive disc tltowaird thedriven disc {i4-.-Y Thusfvvlien tlielug .lesion levereizf moves intdtheinclined,portionidof the camvslot under the.4 inuence. of .torsion: spring I4;8,z-the Sprlrlet-A 56 thereater.. automa-tioally t moi/es the drive, disdaixielly. .toward .thefdrivenodise 2.4..,

The stellst-lf2; Zend m4,; prov-idinslost motion between-...the Bowden Wire. In undv` slide l-I-2',` are soarranged,tirati-lost, irritation.x in af forvverrl-- direction bJetiveen-.ston-LZZ -afnd thefretraeted slideelfI-Z wilt-nottetanen untille-.ver .|26 lietefsvvung the arcuate portion |46 of the cam slot and partway up the inclined portion |44. The distance the lug may move up the inclined part of the cam slot before the stop |22 becomes operative against slide I i2 should be greater than the distance it moves when the drive pin |04 is brought into engagement with recess |08 so that the drive pin and recess may bebrought into driving engagement without drawing the Bowden wire forward far enough to cause the slide I|2 to be moved to operative declutching position. For this reason the recess is made relatively shallow.

However, when the drive disc 96 is moved axially by spring |50 the distance which it is free to move when drive pin |04 is brought into engagement `with aperture |06, then the lever |26 will be swung counterclockwise far enough to draw stop |22 on the Bowden wire |20 into operative relation with the slide ||2 and to advance the latter to operative declutching position. It will be observed, therefore, that the slide |I2 will be moved to declutching position only when the drive pin |04 engages in aperture |06 and that the slide is moved to this position automatically under the influence of springs |48 and |50 when the drive disc 96 is advanced far enough relative to the driven disc 24 to bring the drive pin |04 opposite the aperture |06.

The other stop |24 on Bowden wire |20 operates against the slide I2 when the Bowden wire is retracted. This stop is so arranged that it will not move the slide I|2 from operative declutching position until the Bowden wire |20 has been retracted a distance great enough to cause the lever |26 to carry lug |36 to the lower end of the inclined portion |44 of the cam slot. As a result the drive disc 96 will be fully retracted and will have retracted the drive pin |04 from driving engagement with the driven disc 24 when the declutching mechanism is released by the slide i I2 and the flexible shaft moves into driving engagement with its power source under the infiuence of spring 54. Thereupon the drive disc is rotated so that it moves forward while the lever |26 completes its movement to fully retracted position and returns to its intermediate position under the influence of spring |48, but the driven disc remains stationary until the lever returns to the last mentioned position and releases the drive disc 9B for axial movement toward the driven disc.

To describe the operation of the cleaner, reference will iirst be made to Figs. 2 and 3 which show the parts in the position they assume when the cleaner is inoperative. It will be noted that drive pin |04 is in aperture I 06 in the driven disc 24 and the slide I i2, therefore, is in declutching position and that lost motion in a forward direction between the Bowden wire and slide has been taken up. Furthermore, the declutching lug I I8 on drive disc 96 has rocked control plate B and lever 'i2 to a position at which the flexible drive shaft 40 is disengaged from its power source.

To start the cleaner the Bowden wire is fully retracted. Before lost motion between the wire and the slide i i 2 is taken up the lever |26 will be swung i'ar enough to move the lug |36 to the lower end of the inclined portion |44 of the cam slot i, thus causing the drive disc 96 to be retracted against the resistance of spring |50 and fully to withdraw the drive pin I 04 from engagement with the aperture |06 in the driven disc $24 as seen in Fig. 4,

Upon further retraction of the Bowden wire suiiicient to move the slide from the position shown in Fig. 2 to the position shown in Fig. 6, the declutching mechanism is released for return to inoperative position under the influence of adjusting spring 86 and thus releases the flexible shaft 40 for axial movement in a direction to engage clutch elements 50 and 52 under the influence of spring 54 as previously explained. While the Bowden wire is retracting the slide II2, the lug |36 moves in the arcuate portion |46 of the cam slot |38 and thus holds the drive disc 96 in retracted position. Thus the wiper operating mechanism including drive disc 96 starts rotating while the drive disc is out of driving engagement with the driven disc 24, so that the latter remains stationary, and, therefore, the drive pin |04 moves past the aperture |06.

Upon release of the Bowden wire, the torsion spring |48 rotates lever I 26 counterclockwise until the lug |36 enters the lower end of the inclined portion of the cam slot |38. The drive disc 96 is then free to move axially under the infiuence of the spring 50 until the end of the pin |04 is brought into engagement with the side of driven disc 24. This has no effect on the driven disc 24 because the frictional restraint afforded by the wiper connected to this disc is sufficient to prevent movement of these parts while the pin |04 slides over the side of this disc. When the drive disc 96 has moved ahead far enough to bring the drive pin |04 opposite the recess |08 in the driven disc, the spring |50 moves the drive disc axially until the drive pin engages the bottom of recess |08, as seen in Fig. 8. This establishes a driving connection between the drive disc and driven disc and the latter thereupon rotates with the drive disc and oscillates the right-hand wiper blade.

At the time the pin 94 drops into recess |08 the operating mechanism I4 has moved forward 270 and has moved the left wiper blade (Fig. 1) from its parked position to its innermost position and approximately halfway back to its parked position so that it is displaced out of phase in its stroke with respect to the position of the righthand blade.

During the course of the counterclockwise movement of the lever |26 under the influence of springs |48 and |50 the Bowden wire |20 is advanced, but this has no effect on the slide II 4 because the lost motion between the slide and Bowden wire is sumcient to accommodate for this movement, the recess |08 being shallow enough to prevent the drive disc 96 from moving forward far enough to cause the Bowden wire to become effective against the slide. The cleaner, therefore, continues to operate with the blades 90 out of phase in their stroke.

To discontinue operation of the cleaner the Bowden wire is first fully retracted and then released. Retraction of the Bowden wire again retracts the drive disc 96 to the position shown in Fig. 4 and thus fully withdraws the drive pin |04 from the recess I 08. The frictional drag between the windshield and the blade connected to the driven disc 24 (right-hand blade in Fig. 1) causes this blade and the driven disc to stop; but since the slide II2 is in retracted position the flexible drive shaft 40 remains in driving engagement and drives the actuating shaft I8, drive disc 9E, and rear crank arm 20, thus moving the drive pin |04 toward the aperture |06 in the driven disc 24 and continuing the oscillation of the left-hand 2,/6 L1 blade. After approximately 90 of rotation of the actuating -shaft`i'8 and"drivedisc96iifthes'drive pin`1 |04 lis- 'brought opposite' the"apeture"' lilla' fin the vdrivenidiscand'tl'ieespring lfthen rnoves the drive disc forwardaxiallyjfforeirig"the"drive ofthe twobla'des 'continues'in phase'until'thelug l-"l 8 engages the slide-I i2^ `a`nd ldiscontirlues4 operiationl of lthe 1 cleaner." *Aspreviously explained,l thisoccursf-'whemthe blades reach v`their outer; most position.

-From the above description of the operation of the' cleaner, thef-- ease' "of contrlling operation thereo'will be apparent; Ine-starting* or's'toppinig the vcleaner itis merely necessary in'eitherc'ase to-retractthe VKBowdenwirefully andj then ree' lease-thesame inasmuchasthe'spring {4"8`thereupon automaticallysrotates the lever I 26A counterclockwise far enough 'to release the 'drive-disc 9:5 for-axialmovement under'theinuence of spring I 50,-thu's"furtherf'frotating 4the lever l fThis draws the "Bowden'wirevl forward a distance determined-byiiwheth'eritlref drive pin |04' drops into'the aperture-106er recess |08; the latter case* which occurs iwi-ien; "the a cleaner is 'being started, the shallowness 'of the-recess prevents the cause the-Bowdenwiretto advanceth'e slidefl`l2 tor declutching positions-f However; when* the drive pin engages intheaperture "|06` then the drive discmoves far enough-axially t6 move 'thelever 126 to inoperative'position Iand incidentally cause the Bowden-` wire -tof advance the isli'de to declutchingv position, `the-*spring- Hill being lstrong enough -to causethe slide to "bef-operated. "Thus the operation ofA the device-is automatic after: the' Bowdenwire has i-beerrfully retracted`l and then r'eleased.*V4 VASincethe slide H2 can be moved forward to declutching position only when the driveipiirll enters the-aperture i B6 in the driven tdiscitfvvill beY apparent that 4'the-"two wipers'imust 'always' be broughtwfinto i phase "before coperatiorr` offftlie cleaner 'Y can-v -be discontinued irrespective the position -of the l'declutchin'g'* lng ,1"I'8jfwhen' the" Bowden wire'f'is retracted-"tofstop fthe cleaner?V This: insuresethat botlrblades 'will ialways pa'rlcat the same' position relative* to =the windshi'eld"""efj atftheir outern'iost'position3=` ""i if* iff-'"- f @In-Fig. 9 the variation in'torque in inch ounces during the' variousE phases in thedoycle offdp'rai' tion of a windshield-cleaner Efravinetwe blades operating in phase/witl'rboth' blades-ratA correspending positionnnetheir* stroke,andanotlier t cleaner of the fsame "type"havingbladesdscillaitinig`V outfrofi phasewith'E the"1blades1"'displaced 90"^i"n" th'eirffstrcikerY isL-fgaph-ically shown'f'lie inch ounces :of tc'nque` requiredt foperatebotl cleaners isV plotted against '270 intervals `of rotation 'of the ilexible drive shaft-.E The "graph" covers the nieve mentl of vboth blades through?)ne"coinplete"cyele or^stroke` It 1will"'be""'r1ot'e"d that "a 'totali' oi?` y revolutions of therlexibleidrive*shaft are'inecese" sary `lto drive-"the wiper Y"bladesthrough 'one "come plete Stroke; i ,L- o v.- -z- .v nur: f, :y Inbothcleaners he load on the flexible Snaffg varies generally sinusoiidally. For the cleaner operating" i'n" afcofentionali manner the torque applied'bythe fleiiible'" 'shaft varies lfrom'approxi mately efin'choiices f'to approximately 3e y-in'cn 'lces. For'the impovedilean'er' `f ithepresert inventiorjthe trde'iappliedbythe flexible lshalt varies" romia' minimum 'ofapproximately 1'8 inch ouncesiit amaiimulof approiimately 35 1in'ch ounces.` It will" bei noted, therefore, that the maximum" torque' reiuied te 'operate'the two windshield cleaners `is"'approximatelythe same;

However; thefvariationbetvveen this maximum andtheminimi'torque required to oscillate the bladesismuchiless iiithe cleaner'of the present invention.' v"'I'hus'the amount oyffwinding and unwindingof the 'core of 'the' "flexible lshaft'is greatly reduced in the cleaner Iofthe-present invention-'so tli'at'tle shaft doesn" "wearnea'rly as Vrapidly as thashaft in 'a'clean ucperatiiig Vi'na conventional r V-. )I .^C .cxma* H2 :Q 'A I From the above description of the construction and operation' of 'the' improvedwindshield cleaner ofthe presentinverition, 'it' will be'apparent that wear^on"theflexlbledrive shaft is greatlyV reduced by`oscillati1g""the W 'er"""blade`s outof JAphase.`

blades i'ssuch that there" are recurrent cycles' ci operation" which is "noi'more obj ec'tionable trom the' `fviewer"s""'standpoint' than "operation o f a standard cleaner with two blades operatingV in 1 6 .L.'- AS :u '.`z1-i Xlrs zia." y

Operation of the blades out of phase is eiected by lmecha.riisr of 'eitrenelysir'nple construction whi'eli'ma'vlb' manufactured atl 'little c'os'ti "FurL tli'ermcre; :parking "of both i blades 'at' the same p'os'itiori"relativeto"thewindshield 'is n'ot dom'- tner'epr inapte maewithout "departing" frein the' under'iyingpr'incipiesef the'nvention." I,

therefore,` desire`lytle following claims, to include'withirthe scope of"'t`l1`invention Iall such variatinsandindiieato bywhich substantially 'the result's'iim nvention' may be obf "ubstantially'tliesame Orweq'valipm'ans. 'y

I claim: y 1'.'A'windshiel d cleaner comprising a pair of movable'wiper elements,"p`owerwdriven wiper op'- mentsine'ans o'perable temporarily to break the driving connection vt onewipe element before said"wipenop'erating*mechanism starts" oscillatingthe`second of saidl"'wip`r elements to 'cause the rst of 'sa'id elemits'toftrailth'e second while tl'ie cleaner'is operating,"and'operable before said wiper p'eating` mechanism 'breaks the driving connectiorf't'o`said"second wiper' element to break the'd'rivg on'ectintosaid'rst'wiper elementV Iwhile the second is moved` to a corresponding position" relative td'th "windshield,i and a manually` operablecontr'olto control operation of said wiper operating mechanism' operable to condition the means `for=br`eaking the driving connection trhefnrst wiper-feiementlfor operating in thei-aforesaidjnianner"when:the control is operated to' start and' stop Xoliiera'tion of the wiper operatingi'meclianism'.

*25'AfWndSheldCleaner comprising` a pair ofv movable wiper elements, wiper operating means for oscillating said wiper elements, drive means to drive said operating means, means operable temporarily to break the driving connection to one of said wiper elements, a manually operable control to control operation of said drive means and the means for breaking the driving connection to one wiper element operable to condition the latter for breaking the driving connection to said one wiper element temporarily when the control is operated to start operation of the drive means so that said wiper elements are at different positions in their stroke when the cleaner is operating, and operable when the control is operated to discontinue operation of the drive means to cause said means for breaking the driving connection to one wiper element to become effective before operation of the drive means is discontinued long enough to cause the other of said wiper elements to be moved to a corresponding position relative to the windshield.

3. A windshield cleaner comprising a pair of movable wiper elements, separate power operated means for moving said wiper elements over said windshield to clean predeterminedV areas thereof, means for controlling operation of said power operated means including means to arrest operation of said power operated means and other means to render said separate power operated means effective in sequence so that one wiper element trails the other throughout their movement over the windshield and to interrupt operation of one of said power operated means and thereby interrupt operation of one of said wiper elements while the other is moved to a corresponding position relative to the windshield immediately before operation of both said powerl operated means is arrested so that the wiper elements stop at corresponding positions relative to the windshield, and manually operable means operable to condition said control means for operation in the aforesaid manner upon consecutive movements of the manually operable means.

4. A windshield cleaner comprising a pair of movable wiper elements, drive means including a rotatably driven shaft, a source of power to drive said shaft, clutch means to connect and disconnect said shaft and source of power, mechanism driven by said shaft for moving said wiper elements operatively connected to said shaft at a position to hold the wiper elements at corresponding parked positions relative to the windshield when the cleaner is inoperative, a manually operable control for said clutch means, means operated by said control when the latter is moved to cause said clutch to be engaged or disengaged to release part of said operating mechanism temporarily so that said wiper elements are at different positions in their stroke when the cleaner is operating and so that operation of one of said elements is interrupted before the clutch is disengaged long enough for `the other wiper element to be moved to corresponding position relative to the windshield.

5. A windshield cleaner comprising a pair of movable wiper elements, separate operating mechanisms for moving each of said wiper elements over said windshield, a source of power to operate said operating mechanisms, separate clutch means including a rst clutch means to connect both of said operating mechanisms to said power source and a second clutch means to release one of said operating `mechanisms from said power source, and a single manually operable control for operating both said clutch means operable to release the second clutch means prior to the time the first clutch means is engaged or released for an interval long enough so that one wiper element starts moving before the other and precedes the other throughout the movement of said wiper elements over the windshield and to cause operation of one of said wiper elements to be interrupted before the first clutch is released long enough for the other wiper element to move to a corresponding position relative to the Windshield.

6. A windshield cleaner as defined in claim 5, wherein a trip member is rotated in coordinated relation with the movement of said wiper elements and the clutch operating means :includes a part movable into the path of rotation of said trip member and operatively engaged thereby to move said first clutch means to disengaged position when said wiper elements are both at one limit of their stroke.

7. A windshield cleaner comprising a pair of wiper elements adapted to be oscillated over a windshield to clean predetermined areas thereof, power driven wiper driving means, means to establish a driving connection between said wiper elements and driving means including lost motion means for causing one of said wiper elements to trail the other, manually operated means to control operation of said driving means, and means operated by said control when the latter is operated to discontinue operation of said driving means for causing lost motion to be taken up so that said wiper elements are brought to corresponding positions in their stroke before operation of the driving means is discontinued.

8. A windshield cleaner comprising a pair of oscillatable wiper elements, rotary drive means, means to establish a driving connection between said wiper elements and drive means including means reciprocated by said drive means, a lost motion connection between said drive means and the means reciprocated thereby to cause said wiper elements to oscillate out of phase, manually operated means to control operation of said drive means, and means operated by said control when the latter is operated to discontinue operation of said drive means to cause lost motion between said drive means and said reciprocatory means to be taken up before operation of the drive means is discontinued so that the wiper elements park at corresponding positions relative to the windshield.

, 9. A windshield cleaner as defined in claim 8, wherein the wiper elements are substantially 180 out of phase `when they are in parked position and the lost motion means provides lost motion of approximately 270 between the drive means and the means reciprocated thereby when operation of said cleaner is started so that said wiper elements oscillate substantially out of phase and provides lost motion of approximately 9G in the same direction when the control is operated to discontinue operation of the cleaner so that said wiper elements return to a position approximately 180 out of phase before the cleaner stops operating.

10. A windshield cleaner comprising a pair of oscillatable wiper elements, a rotary shaft, a source of power to drive said shaft, means for establishing a driving connection between the wiper elements and shaft including reciprocable members connected to said Awiper elements oscillate the latter and rotary means driven by said shaft for imparting reciprocatory movement to said reciprocable members, a lost motion drivins .denne-eilen 4lo.eiineeri lsaid rotary means and f t sense said ary means to reciprocate said; reeioreeable membereoot .of .obese softhae seid- Winer elements are ai .different positions in siidke wiieiifthe eleemer.-is openaiine, means drivirien to .o orineet and `di.seonneei said shaft edd 5.0.1.1r0e of no vver.7 a manuallyoperable Control fdr Seid lesb mentioned ineens, and means oper.- eied by seid Qontrol whenv the latter is operated to ,disconnect said kshaft .and power source to cause lost motion to betakennpbefore said shaft iS di00iiiie0ieds0 iliaisaid. Winer elements stop et v ciiliedpGliding bdsiiiens relative to the `vvindshield.

`l e vvmdsbield. cleaner eomnrisme a pair of Winer elements ddeoiedio beoseillaied over a Windshield i0 eisen ore .rinined areas. thereof, Winer .driviner mednsla sourde o f oovver to drive diliiwiliei" .driving means, means drivinslv to connect and disconnect saidsoliljce of power and Winer driving means inoliidine e manually eoerable control, and means rendered eflecltive by obeeiiieri .0i seideeriirol to eedseone viper .elediedi i0. trail. vine 0 r timoneboni riiovemerit of thel wiper elements over the .windshield and i0' edlide die vivo Winer .elements i0 be broiieiii io e'orresbondins n.0 ons in their siroise when saidfcontroi is operatel vtodisconnect said source of. power and wipeifdrvingmeans before,thedrivi inseeriiieoiiorrbeivveeri seid -oeris is broken.

12- d Windshield oleener Comprising el noir di wider elements adapted t.dfb-e oseilleied over e Windshield 'i0 Clean predetermined erede ib-ere- O'f, ivibei d iviiig meent .a sourde of oovver to drive Seid Winer drivinameans .e Qontrol oserei-ble bienndilvl io' eloiiirel 'die dneiioaiion of oever from seid Sbliide i0. Seid Winer driving mee-ns, mee-'ris io esieblisli'e driving ednneeiion between die Winer eleme'riis and driving ineens indiv-dine delayed action means operable by said control when ihe. 'leiter is onerdied i0 sense newer io be ennlied i0 seid vviber drivi s means, id ednneei one wiper element .to said ,dr Iving'Irisa-Ils at a predetermined inie'rvdl'afier ilse. einer idr Candide seid one element i0 breil ilieoilier in their inovef nent over'the windshield, and operable whensaid eoriirel is operated iodisooriiinne. die eonlieeiien oibevfer i0 seid' winerdirivins mea-ns io diseori: nect'one wiper elementffrqm the driving means before ebbli0dii0'ri oi power i0. driviiis means ceases for en interval 0f s iiiiieierii derailed. i0 canse the other element t'o be'brou'ght to a oorrespending positioniin its stroke.

le A' Windshield eieener deiner/iside e. noir 0i movable. wiper elements, separate. Winer operaties means for operatinglsaid wiper elements, drive ineens. io drive seid onereiine mea s ideiddids mee-iis nermenenilv oo nneeiine 0f, seid 0bera-ting means to said drive means and drivingv and driven elements said driving element being in permanent driving connection with 4said drive means and said driven element being drivinglv connected to the secondiwiper. element, means to control operatonof id dr meansfmeansto bias said'driv'in and driven"elementsrelatively towardeach other and saidcontrolnneansfto a position i0 diseoniinueoperation' Mei seid" drive means, end means. i0, blieb e, driving eonneee tion between said driving, and driven elernelzntsy when said wiper elements are either at predeterf. miniid HOUCOHDQPSI" 11T felt Plefle'fimlled Corresponding 'positions reldiiveie. iliewindsbield end i0, erresi movement. oi said 'driving and. driven. elemenisund. ine meensrbofore. the. le.

he 'niliienoe 0i said bids; .beoomesieiieotive to,

bias :s said .control :in a direction to discontinue operation 4of the 4cleaner .except when said .driving .and driven means are at an operating position at which said wiper .elements are in ,correr sponding positions relative to the windshield.

14. A windshield cleaner comprising a pair of movable wiper elements, a rotatable drive shaft, means to establish a permanent `driving connec: tion between one of said wiper elements and said shaft, relatively movable .driving and driven elements, said driving element having a permanent .drivingeonneotion with seid Vshaft .and said driven element Vbeing connected to move said second wiper-element, clgtch means to con.- nect said shaft and source. of power biased to operative position, declutohing mechanism to move said eliitoh means. to :inoperative position including a part movable to and from an ope erqative posi-tion atwhhsaid decl-etching means.

is positioned fordiseneaeine .said clutch, means.

to bias said l driving and driven elements relatively toward .eeieii other, ineens i0 apply the biasing ioroe 0f said biesine ineens io the mov.- alole nari of. seidL deelniehing mechanism ion urging the same top operative position, and means to establish a driving connection between said driving and driven elements when the wiper elements are either et predetermined nonoorrespending or ai nredeiermined eorresnendine positions relative ,i0 'diev Windshield ineliidiris means i0 limit movement 0f the driving andv driven elements under the influence of said biasing siifiieieri-ilv i0 vprevent the leiter from biasing the movable eert of. said, deelliieliideme. ifo operative position escient when seid. driviiieandy driven elements die ai an @bereiddebesiiion; di ivbieli ille tWo WinerV elements are in corresponding positions relaiiiffei'o die. vviiidsliieldf 1.5, A Windshield eleerier es defined in eleim.

movable ttf"iconcri'tion the latter for operation is movable into thepath of rotation of said trip I neniber and is engagedthereby when both wiper elements are at oneend of their stroke.

1d. A windshield cleaner comprising a pair ofV wiper-elements rotary windshield Wiper operating means including driving and driven means,V

a source of powento 'rotate said operating means, means for eslieblisiiine e drivingeonneedon be# tween one oi the wiper elements and said 'driving means and between the other wiper. element and said driven I neans2 cooperating means on said driving anddriven means movable between a first relative position at. which a driving conneotion is established thereby between said driving andl driven means for. oscillating said wiper elements. ina phase. relationship at which the Wiper elements are at noncorresponding positions in their stroke, and asecond relative position at which adriving connection is established thereby between th vdri for Oseiileiioe wine.. elements. iiie phase reiationshipat which the wiper elements are at the ennlieeiion of novverthereto, and means op-. ereted bv Seid Control. means when the. leiter;

is enereied; to, emily; newer io said. oo eretine means lS0 eerselseid eooneraiineineens.: i0 moveg andY driven means 17 means is operated to discontinue the application of power to said operating means.

17. A windshield cleaner having relatively low and relatively constant power consumption, comprising a pair of Wiper elements movable through back and forth strokes over respective areas of the windshield, a movable linkage positively interconnecting the wiper elements to position the latter a fraction of a stroke apart, and a single power operated motor means for moving the linkage to move the wiper elements simultaneously, with one element out of phase with the other by said fraction of a stroke.

'118. A windshield cleaner having relatively low and relatively constant power consumption, comprising a pair of wiper elements movable through respective stroke cycles over the windshield, movable means positively linking the wiper elements to position them approximately one-fourth of a stroke cycle apart, and a single power operated motor means for moving the movable means to move the wiper elements simultaneously with one element out of phase with the other by approximately said one-fourth of a stroke cycle.

19. A windshield cleaner having a relatively low and relatively constant power consumption, comprising a pair of wiper elements reciprocable over respective areas of the windshield; a movable linkage interconnecting the elements including rotatable means having a pair of cranks spaced approximately at right angles, and a pair of means respectively connecting the cranks with the wiper elements; and power operated means for moving the linkage to rotate the cranks and thereby to move the wiper elements simultaneously with one element out of phase with the other by approximately one-fourth of a stroke cycle.

20. A windshield cleaner having a relatively low and relatively constant power consumption, comprising a pair of wiper elements reciprocable over respective areas of 'the windshield; a movable linkage interconnecting the elements including a pair of reciprocable means respectively connected to the elements, a pair of rotatable means to reciprocate the respective reciprocable means, and means nonrotatably connecting and positioning the rotatable means approximately at right angles to each other; and power operated means for moving the linkage to rotate the rotatable means and thereby to move the wiper elements simultaneously with one element out of phase with the other by approximately one-fourth of a stroke cycle.

ARTHUR C. ALLEN.

References Cited in the file of this patent UNITED STATES PATENTS 0 Number Name Date 1,719,660 Horton July 2, 1929 2,079,573 Lauer May 4, 1937 

